SMP, (Symmetric MultiProcessing)
a multiprocessing memory design where all processors compete for access to the centralized shared memory bus connected to the main memory as used in early microcomputer multiprocessor systems with two, four or even eight processors. SMP includes systems with CPUs implemented in separate chips, systems with CPUs implemented in the same chip (multi-core) and combinations (e.g. a system with 2 separate quad core chips, with a total of 8 physical CPUs) [1]. With increasing number of cores and processors bejoind 8 to 12 CPUs [2], SMP with its uniform memory access becomes more and more a bottleneck in scalability - more recent systems such as x86-64 with multiple cores use the NUMA (Non-uniform memory access) architecture instead. Nevertheless, the term SMP search has become synonym for parallel search using a shared hash table, also manifested in the term Lazy SMP.